THERMODYNAMIC MODELING FOR PETROLEUM FLUIDS - II - PREDICTION OF PVT PROPERTIES OF OILS AND GASES BY FITTING ONE OR 2 PARAMETERS TO THE SATURATION PRESSURES OF RESERVOIR FLUIDS

This paper is devoted to the description of a method for modelling hea vy cuts, using either a T.B.P. distillation or an advanced chromatogra phy analysis method. Two sorts of reservoir fluids are defined dependi ng on the advancement of the geochemical catagenetic reactions occurri ng during the history of the petroleum deposit. Given the existence of differences due to the geochemical history of fluids, two different t hermodynamic characterizations may be computed from any given analytic al information, One is generally more suitable for use with condensate gases and the other is more appropriate for calculating the physical properties of crude oils, The method presented here involves tuning on e or two parameters to one of several saturation pressures of the rese rvoir fluid. This approach was tested on a data base including more th an 50 reservoir fluids. In most cases, the PVT properties predicted us ing the above method were highly satisfactory. (C) 1997 Elsevier Scien ce B.V.